If you
suffer from diminished ability to naturally focus your eyes,
lined
or round multifocal eyeglass lenses (bifocal and trifocals) containing two
or more distinct lens powers may help you see more efficiently
at multiple distances. However, you should see our eye doctor to
diagnosis the cause of your diminished ability so we may
ascertain the correct reason and solution for any visual
impairment.

"Bifocal"
means "two focuses"... literally. Multifocals are eyeglass
lenses that enable you to see clearly at two different distinct
distances while only using one lens. Benjamin Franklin has been
credited with inventing the first bifocal lens by cutting two
lenses in half from two different lens prescriptions and gluing
them together. The top half was used to see greater distances
while the lower half assisted greatly with viewing objects and
text within arm's reach.

Bifocal glasses are used for
many reasons, but the most common reason is Presbyopia.
Presbyopia is a vision condition in which the crystalline lens
within the eye looses its flexibility thus hampering the ability
to focus. One may need a multifocal lens simply due to age. On an average, once you hit 40 you may became a
good candidate for these lenses, although you may require
multifocal
lenses at a much earlier or later age and for other reasons as
well. Always get your eyes checked for vision and eye health
reasons.